2011-09-30_PERMIT FILE - C1980007A ‎(2)‎

• Permit No: C1980007A
• IBM Index Class Name: Permit File
• Doc Date: 9/30/2011
• Doc Name: Refuse Pile Expansion East
• Section_Exhibit Name: Exhibit 82 Refuse Pile Expansion East
• Media Type: D
• Archive: Yes

Refuse Pile Expansion East
Mountain Coal Company, LLC
West Elk Mine
January 2010 JR 120)
Revised March 2010
Revised April 2010
Revised August 2010 (MR 368)
Revised July 2011 JR 127)
Table of Contents
Certification.................................................................................................................... ..............................v
1.0 Introduction .............................................................................................................. ..............................1
3.1 Hydrologic
2.0 Geotechnical Investigation and Design .................................................................... ..............................3
2.1 Geotechnical Investigation ............................................................................ ..............................3
Hydrologic Inputs ......................................................................... ...............................
2.2 Geotechnical Analysis and Design ............................................................... ..............................4
2.2.1 Software .......................................................................................... ...............................
5
2.2.1.1 Seepage Modeling ............................................................ ...............................
5
2.2.1.2 Stability Modeling ............................................................ ............................... 6
2.2.2 Model Parameters ........................................................................... ...............................
7
2.2.2.1 Refuse ................................................................................ ..............................7
2.2.2.2 Colluvium .......................................................................... ..............................8
Hydrologic Inputs ......................................................................... ...............................
2.2.3 Model Results ................................................................................. ............................... 9
2.2.3.1 Model Results ................................................................... ............................... 9
2.2.3.2 Geotechnical Design ...................................................... ...............................
10
2.3 Subsidence ................................................................................................... .............................10
Impoundments, Other Treatment Facilities and Diversions (Rule 2.05.3(4) & 4.05.6)
3.0 Hydrologic Analysis and Design ............................................................................. .............................12
3.1 Hydrologic
Water Balance Anal ysis ............................................................ .............................12
3.1.1
Hydrologic Inputs ......................................................................... ...............................
12
3.1.2
Model Parameters ......................................................................... ...............................
13
3.1.3
Model Results ............................................................................... ...............................
14
3.2 Hydrologic
and Hydraulic Modeling ........................................................... .............................14
3.2.1
Hydrologic Inputs ......................................................................... ...............................
15
3.2.2
Modeling Results .......................................................................... ...............................
15
3.3 Ponds,
Impoundments, Other Treatment Facilities and Diversions (Rule 2.05.3(4) & 4.05.6)
15
P. \Mpls \06 CO \26\06261003 RPE E Permit Mod Support \WorkFiles\Permrt Apphcation \Text \Exhibit 82 RPEE design 2011 -07 -21 TR 127 doc i